Re: [Xen-devel] (XEN) Xen BUG at page_alloc.c:385

To:	Jan Beulich <JBeulich@xxxxxxxxxx>
Subject:	Re: [Xen-devel] (XEN) Xen BUG at page_alloc.c:385
From:	Dietmar Hahn <dietmar.hahn@xxxxxxxxxxxxxx>
Date:	Wed, 20 Oct 2010 10:50:43 +0200
Cc:	xen-devel@xxxxxxxxxxxxxxxxxxx
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Am 19.10.2010 schrieb "Jan Beulich <JBeulich@xxxxxxxxxx>":

> >>> On 19.10.10 at 14:16, Dietmar Hahn <dietmar.hahn@xxxxxxxxxxxxxx> wrote:

> > (XEN) Xen BUG at page_alloc.c:385

> >

> > The code line is:

> > BUG_ON(pg[i].count_info != PGC_state_free);

> > Is it possible in any way that a free page is in use? Or is it always a

> > failure somewhere in the code like a multiple use of the same page?

> Free pages are never in use for anything, so getting this BUG_ON()

> to trigger means e.g. something modified a page's state after it was

> already passed back to the allocator.

> Did you check that this is not another manifestation of the problem

> fixed by c/s 22135 (we have a backport of this in our tree, but it's

> not clear whether yours already has this).

Sorry I wasn't aware of this fix and the backport is not in our source.

Thanks.

Dietmar.

> Jan

Company details: http://ts.fujitsu.com/imprint.html

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Re: [Xen-devel] (XEN) Xen BUG at page_alloc.c:385